How it works: British retail giant Asos now offers small boutiques and independent sellers the opportunities to sell directly to their audience with the Asos Marketplace. The Marketplace is set up as a series of smaller boutiques — around 750 in all — selling indie brands, vintage clothes, and gently worn garments.

The cut: Hosting a boutique on Asos costs £20 a month, or around $32, and Asos takes 20 percent commission.

The catch: Asos requires that you have a minimum of at least 15 things in your boutique at any given time, so this might not be ideal if you're just trying unload last year's winter coat.

How it works: Bib and Tuck makes it easy to sell designer clothes and accessories — emphasis on designer. The site prides itself on young, fun, and cutting edge curations from designers and retailers like Alexander Wang, Opening Ceremony, TopShop, and Asos. They'll send you prepaid shipping labels when you sell something, and will even pick up your packages for you for free if it's too big to ship from UPS.

The cut: You keep 85 percent of any sale and they get a 15 percent commission.

How it works: You send Klury a picture of what you're sending and they'll get back to you with a quote of how much they think they can sell it for. Klury buys both men's and women's clothing and accessories.

How it works: Material Wrld is a site that will collect and pay you for your gently used designer clothes. If you live in Manhattan they'll even come right to your house and pick up the stuff from your door. Plus, the site has a handy quote calculator that helps you determine how much you should expect to make.

The cut: It varies, but you won't be making cash back — Material Wld pays out in gift cards to Bloomingdales, Steven Alan, ShopBop and Saks Fifth Avenue.

The catch: There is a very highly curated list of brands that Material Wrld will purchase, and the list is culled regularly, so you'll need to check often to make sure they'll still accept your Ralph Lauren blazer.

How it works: Poshmark lets you easily sell items from the comfort of your home. Simply upload photos of the items you want to sell to the site (and use one of the site's filters to make it look pretty); price it; then wait for it to sell. Once it's been snatched up by someone, Poshmark will even provide you with prepaid printable postage label so you can easily ship your item out to its new owner.

The cut: The selling fees are a little high—There's a $2.95 fee for any item you're selling up to $15 and for sales of $15 or more, you keep 80 percent of your sale and Poshmark's commission is 20 percent.

The catch: It's currently only available in the U.S. and they only take women's fashion and accessories.

How it works: The RealReal is a one stop consignment shop that allows you to consign virtually everything — women's and men's clothing, art, housewares, jewelry and more. It seems like The RealReal focuses on a fairly exclusive, high end clientele, interested in getting rid of last season's purchases to make room for newer, fresher stuff.

The cut: Considering the level of products you're probably selling, you could stand to make quite a bit of money with their service—if you can deal with their exorbitant fee.

The catch: The RealReal's fee structure is steep compared to other online consignment shops: They take a 40 percent fee.

How it works Re{fashion}er aims to be the resell site for all things vintage and one-of-a-kind. Got a cool '70s polyester shirt you wanna get off your hands, or a '50s poodle skirt? Re[fashion]er is the place to list it. According to their site, Re{fashion}er aims to "give the great under-worn pieces from epic closets a good send-off, & pass them on with love."

The cut: The site takes a 22 percent cut of any sales.

The catch: There's a high level of engagement required to be a part of the re{fashion}er world — including multiple images for every item you list, writing a bio for your account, and talking about what the particular item you're selling means to you. The idea is that you're building a community of vintage obsessives as you're making money.

How it works: Shop Hers is a bit more of an upscale site, catering to women with designer tastes. Only luxury brands are allowed, but if you've got an extra pair of Louboutins or two to get rid of, this is the place to go. They also offer a VIP Experience for busy/lazy people, where they'll do all the work of uploading your goods to the site and selling things for you.

The cut: Shop Hers takes an 18 percent cut for regular transactions, and a 35 percent fee for "VIP" clients.

How it works:Snob Swap offers you three ways to make money: You can sell your items online, swap your items for other things on the site you want, or you can have the site's concierge service sell your clothes for you.

The catch: While the swap feature sounds great, what are the odds that somebody is really gonna want your used J. Crew dress in exchange for her super cool Balenciaga sunglasses.

How it works: Threadflip is the ideal service for the lazy reseller. Their Full Service feature allows you to simply mail in all of your unwanted clothes via a prepaid box and have Threadflip's team shoot and sell your clothes for you. You can also list it yourself if you like.

The cut: Threadflip takes a 20 percent cut.

The catch: Whether you sell yourself or opt for Full Service, the 20 percent commission fee is still the same, so it seems like it makes sense to take advantage of the Full Service option.

How it works: thredUP buys women's materinity, juniors and kids clothes — and they make it easy to sell your stuff. They'll send you a bag for you to ship all of your gently used clothes to their sorting facility, where their team will sort through and price your items. Anything they don't take will be donated to one of their charitable partners.

The cut: thredUP pays up to 80 percent of the resale value and offers shopping credits or cash payments via Paypal.

The catch: If you want the items they don't accept returned to you, you'll have to pay a $12.99 fee.

How it works: Tradesy lets you sell directly from your closet. You pick the clothes and shoot photos of the items from your closet, but they'll help you with shipping — they send you a shipping kit for every item you sell — and handle the messy business of returns. Tradesy allows you to set the price of the item, or will suggest a sale price for you if you want, too. They claim to pay around 15 percent more than other online marketplaces. Bonus: Tradesy will help clean up your photos and make your images look more profesh for you.

The cut: Tradesy takes a 9 percent fee and you keep the rest.

The catch: Tradesy seems to list higher end designer goods and fewer mass market brands, which is great if you're drowning in Tory Burch and Kate Spade, but it may not be the best place to list your more affordable garments.

How it works:Twice is a resell site for more casual brands like J.Crew, Ann Taylor, Gap, and Express — though they're pretty adamant that they won't take clothes from Walmart, Forever21, H&M or Old Navy. You can request a free mailing bag and shipping label to send all of your stuff in.

The cut: Twice pays for your clothes upfront, rather than waiting until they sell to pay you, and you can choose to get paid via Paypal, Venmo, check or store credit (where you can make up to 25 percent more back). If you don't like the offer they've made for you clothes, you can "decline" their offer and have your clothes shipped back to you for a $4.95 shipping fee.

The catch: Rejected items are sent to Goodwill, and if you want to get any of the clothes they've rejected back you have to pay a $4.95 shipping fee.

How it works: Vaunte is designed as a super curated alternative to most online selling sites. The site has a list of around 400 brands that it accepts, and will only sell items that are from those brands. Users upload their own products and sell directly from their closets and Vaunte reserves the right to approve all items that are for sale on its site. If you've got a particularly cool set of items for sale, you could be featured in the site's daily newsletter. .

The cut: Vaunte takes a 15 percent commission.

The catch: All payment is made approximately 30 days after the buyer receives her product, so if you're looking to make some cash quickly, this site probably isn't for you.

How it works: You can sell your stuff directly or have Walk In My Closet's concierge service sell it for you. They accept new, pre-owned and vintage designer goods. And there's a social network aspect of the site — you can join or start a "clique" to meet potential buyers. *[Note: The site currently seems to be down.]

The cut: Walk In My Closet takes 25 percent.

CORRECTION:Shop-Hers' transaction fee is 18%. An earlier version of this post misstated that Shop-Hers' transaction fee was 82%. (9/30/14)